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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul li:first-child{
            background-color: red;
        }
        ul li:last-child{
            background-color: pink;
        }
        ul li:nth-child(2){
            color: blue;
        }
        ul li:nth-child(3){
            background-color: aqua;
        }
        ul li:nth-child(4){
            background-color: blueviolet;
        }
        .box{
            width: 400px;
            height: 50px;
            background-color: #f5f5f5;
        }
        .box:hover{
            /* 鼠标变小手 */
            cursor: pointer;
            color: pink;
            border: 1px solid red;
            background-color: #fff;
        }
    </style>
</head>
<body>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
    <div class="box">
        黄金套链足金十全十美项链F001811 约2.78克-2.8克
    </div>
</body>
</html>